madhu314

//lets say you have service XYService and a UI component XYFragment

//this piece of code goes in XYFragment

Intent serviceIntent = new Intent(context, XYService.class);
// add result receiver
serviceIntent.putExtra(XYService.RESULT_RECEIVER, new ResultReceiver(null) {
			@Override
			protected void onReceiveResult(int resultCode, Bundle resultData) {
				// receive the result for this call

madhu314

@AutoValue public abstract class Article implements Parcelable {
  //.....
  public static final ArticleTimestampComparator timestampComparator =
      new ArticleTimestampComparator();
  public static final ArticleAuthorComparator authorComparator =
      new ArticleAuthorComparator();
  public static final ArticleContentComparator contentComparator =
      new ArticleContentComparator();
  public static final ArticleCategoryComparator categoryComparator =
      new ArticleCategoryComparator();

madhu314

  public static class ArticleDataset {

    private static final int DAYS_PRIOR = 20;
    SortedList<Article> sortedList = null;

    public ArticleDataset(final RecyclerView recyclerView, final RecyclerView.Adapter adapter) {
      this.sortedList = new SortedList<>(Article.class,
          new SortedList.BatchedCallback<>(new SortedListAdapterCallback<Article>(adapter) {
            @Override public int compare(Article a1, Article a2) {
              return a1.compare(a2);

madhu314

//....
private void setupAdapter(Bundle savedInstanceState) {
  adapter = createNewAdapter();
  dataset = createDataset(adapter);
  adapter.articleDataset(dataset);
  recyclerView.setAdapter(adapter);
  //...
}

@Override protected ArticleDataset createDataset(ArticlesAdapter adapter) {

madhu314

    @Override public void onBindViewHolder(ViewHolder holder, int position) {
      Article article = articleDataset.getArticle(position);
      holder.bindTo(article, this);
    }

    @Override public int getItemCount() {
      return articleDataset == null ? 0 : articleDataset.size();
    }

madhu314

private void handleEvent(String eventName, Object data) {
    if (HorizontalArticlesFragment.ITEM_CLICKED.equals(eventName)) {
      Article article = (Article) data;
      getHorizontalArticlesFragment().removeArticle(article.dupe());
      getArticleGridFragment().addArticle(article.dupe());
    } else if (ArticleGridFragment.ITEM_CLICKED.equals(eventName)) {
      Article article = (Article) data;
      getArticleGridFragment().removeArticle(article.dupe());
      getHorizontalArticlesFragment().addArticle(article.dupe());
    }

madhu314

//somewhere in activity
private void showSortOptionsDialog() {
  ArrayAdapter<String> adapter =
      new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, new String[] {
          "Timestamp", "Category", "Author", "Content"
      });
  new AlertDialog.Builder(this).setAdapter(adapter, new DialogInterface.OnClickListener() {
    @Override public void onClick(DialogInterface dialogInterface, int position) {
      ArticleSortOptionsActivity.this.newSortType = position;
    }

madhu314

@AutoValue public static abstract class SectionArticle {
  @Nullable public abstract Article article();

  @Nullable public abstract String category();

  public static SectionArticle createCategory(Article article) {
    return new AutoValue_SectionArticlesActivity_SectionArticle(null, article.category());
  }

  public static SectionArticle createArticle(Article article) {

madhu314

public void add(Article article) {
  sortedList.beginBatchedUpdates();
  sortedList.add(SectionArticle.createCategory(article));
  sortedList.add(SectionArticle.createArticle(article));
  sortedList.endBatchedUpdates();
}

public void remove(Article article) {
  SectionArticle sectionArticle = SectionArticle.createArticle(article);
  sortedList.beginBatchedUpdates();

madhu314

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

  <android.support.v7.widget.RecyclerView
      android:id="@+id/recycler"
      android:layout_width="match_parent"
      android:layout_height="0dp"